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Course 58
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Is this code safe? Why?const std::string& GetGreeting(){ std::string s = "Hello"; return s;} int main(){ const std::string& ref = GetGreeting(); std::cout << ref;}Task 1There are n people entering and exiting a room. For each person i, they enter at time a and exit at time b. Implement a function that finds the maximum number of people present in the room at the same time.
For example, given [(1,5), (2,6), (3,7)]:
- at time 3–5 all three people are in the room simultaneously
Task 2Roman numerals are represented by the following symbols:
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
Usually a smaller value follows a larger one: VIII = 8, XII = 12. However there are 6 cases where a smaller value is placed before a larger one - in that case it is subtracted:
IV= 4,IX= 9XL= 40,XC= 90CD= 400,CM= 900
Implement a function that converts a Roman numeral string to a decimal integer.
The input string is guaranteed to be a valid Roman numeral in the range [1, 3999].
#include <iostream> class A{public: virtual void Foo() { std::cout << "A::Foo"; } void Bar() { Foo(); }}; class B : public A{public: void Foo() override { std::cout << "B::Foo"; }}; int main(){ A* obj = new B(); obj->Bar(); delete obj;}Є n людей, кожна з яких входить у кімнату в момент часу a та виходить у момент часу b. Необхідно написати функцію, яка визначає максимальну кількість людей, що одночасно перебували в кімнаті.
Наприклад, для вхідних даних [(1,5), (2,6), (3,7)]:
- у момент часу 3–5 всі три людини перебувають у кімнаті одночасно
class MyClass { /* ... */ }; MyClass a;MyClass b = a; // (1)MyClass c;c = a; // (2)class A{public: A() : m_val(42) {} private: int m_val = 10;};#include <iostream> void Foo(int n) { std::cout << "int "; }void Foo(int* p) { std::cout << "ptr "; } int main(){ Foo(NULL); // (1) Foo(nullptr); // (2)}#include <iostream> class A{public: virtual void Foo() { std::cout << "A"; }}; class B : public A{public: void Foo() override { std::cout << "B"; }}; int main(){ B b; A a = b; // ! a.Foo();}#include <iostream> void Counter(){ static int n = 0; std::cout << ++n << " ";} int main(){ Counter(); Counter(); Counter();}